Incandescent-lamp base.



No. 684,880. Patented Oct. 22 M". A. SWAN.

INCANDESCENT LAMP BASE.

(Application filed Mar. 6, 1899.)

(No Model.)

\A/I HEEEEE. E NT R" J PFred Swan,

m: NORRIS PUERs co; Pnorauma, WASHINGTON: o. c.

UNITED STATES PATENT FFIGE. I

ALFRED SWAN, OF NEW YORK, N. Y., ASSIGNOR TO THE GENERAL ELEG- TRIO COMPANY, A CORPORATION OF NEW YORK.

lNCANDESCENT-LAM P BASE.

SPECIFIGATION formingpart of Letters Patent N 0. 684,880, dated October 22, 1901.

Application filed March 6, 1899. Serial No. 707,906. (No model.)

To all whmn it may concern:

Be it known that I, ALFRED SWAN, a subject of the Queen of Great Britain, residing at New York, county of New York, State of New York, have invented certain new and useful Improvements in Incandescent Lamps, (Case No. 1,049,) of which the following is a specification.

My invention relates to incandescent lamps which are improvements over the lamps described in English Patent No. 16,019, granted to me and dated August 26, 1895, and relates particularly to the construction of the base or collar, and has for its object the improvement of their construction.

In the accompanying drawings, which illustrates an embodiment of my invention, Figure 1 is a perspective view of an incandescent lamp. Fig. 2 is a longitudinal section of the same, and Fig. 3 is a detail view of the supporting-pin.

In certain types of lamps, and particularly those designed for high-potential service, it is desirable to provide bases which are constructed entirely of insulating material, and myinvention is particularly directed to lamps of those types.

7 Referring to the drawings, A represents a base or collar which is composed of a single piece of insulating material-as porcelain, for exampleand is provided with a cup like cavity H for receiving the upper end or neck of the lamp-bulb J In addition to this two small holes B and O are provided in the head for receiving the terminals D and E each of which consists of a small fiat head cl, which rests on top of the base, and a small tubular shank for receiving the leading-in wires of the lamp. In constructing bases of this kind it is of prime importance that the base shall be capable of being molded in a simple mold having no minor moving parts-as pins, for example. I attain this feature by so arranging the holes B and O that they are a trifle larger on the cavity end than on the other. In other words, a certain draft is given to one portion of the die, which permits the base to be readily drawn therefrom. This much is a common expedient in all kinds of molded work; but preferably the amount of draft on the die is increased to a point beyond that lar shank of each contact, so that it completely fills the hole. This is a very satisfactory arrangement and prevcntsthe removal of the contacts by accident or otherwise. In order to secure the lamp in its proper place in the socket, a retaining or supporting pin I is employed, and preferably the holes in the base for receiving the pin are made at the same time that the base is formed. To accomplish this, two projections are provided on one portion of the die, which form theopenings F and G, at the time the base is molded, which arrangement materially simplifies the construction of the die and also decreases the labor of molding. These openings communicate with the cavity H and extend somewhat below the head of the base, so as to permit the pin I to be inserted after the base proper has been finished. The upper portion of the openings can be filled with plaster-of-paris, if desired, although there is no objection to leaving them as shown in the drawings.

The under side of the head of the base is grooved, as shown in'Fig. 2,'to receive the transverse supporting-pin I. The pin I is provided with an offset I',which acts as an anchor to prevent its removal after the parts are By constructing the contacts with perforated or tubular shanks through Which the lead-wires extend I am enabled to mount the base on the lamp and secure the leads afterward, and by drawing them tight before soldering they will assist in holding the base in lace.

What I claim as new, and desire to secure by Letters Patent of the United States, is-- 1. As an article of manufacture, a lampbase composed of a single molded piece of insulating material having a cavity for receiving the neck of the lamp, with holes for re- 'ceivin g the terminals, grooves F and G in the periphery of the base which extend parallel therewith and communicate with said cavity, and a supporting-pin which extends through said groove in the base.

2. As an article of manufacture, a lampbase constructed entirely of porcelain, and provided with a cavity for receiving the neck of the lamp, terminal holes opening into the cavity, openings formed in the periphery of the base, a groove extending across the under side of the head, and a supporting-pin extending through said holes and groove.

3. In an incandescent lamp, the combination of a bulb, a base secured thereto, composed of a single piece of insulating material, terminals mounted in taperedholes in the base, openings in the periphery of the base, and a supporting-pin mounted in the openings and provided with retaining means for preventing its withdrawal.

4.. A lampbase composed of molded material, having perforations tapered their entire length for easy removal from the mold, and provided with contacts in the perforations, which contacts have a greater diameter at both ends than the smaller diameters of the tapered holes.

5. A lamp-base formed of a cup of molded insulating material provided with perform target tions in opposing walls, and a supporting-pin extending through the cup and perforations and projecting exteriorly of the walls.

6. A lamp-base formed of a molded cup of insulating material provided with perforations in opposing walls, and a supporting-pin extending therethrough, said pin being offset within the cup to form an anchor.

7. A hollow lamp-base provided with perforations in opposing walls, a groove in the under side of the head, and a supporting-pin extending through the interior of the base and the groove and perforations and projecting exteriorly of the walls.

8. The combination with a lamp base formed of molded insulating material, of an insulating compound interlocking between said cup and the neck of the lamp-bulb to secure them together, and hollow contact terminals through which the leads may pass, upset in perforations in the cup.

9. The combination with a lamp-base, of hollow insulated contacts mounted therein and upset within the same to permit the terminals to pass through the base and be so cured on the outside.

In witness whereof I have hereunto set my hand this 2d day of March, 1899.

ALFRED SWAN.

Witnesses:

S. N. WHITEHEAD, BENJAMIN B. IIULL. 

